test-webserver: fix Fixture vs TestCase confusion
test-webserver: fix Fixture vs TestCase confusion

The TestCase is the individual case that contains the parameters we want
to test.  The Fixture is the state we use while doing it.

This patch has been brought to you by the magic of sed.

cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit